Re: tasks getting stuck on mmap_sem?

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From: Tony Luck
Date: Tuesday, August 17, 2010 - 11:24 am

On Tue, Aug 17, 2010 at 9:14 AM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:

I did have some similar mmap_sem issues - but the combination of
fixing the types
of the RWSEM_* defines to be unsigned, and the return value of
ia64_atomic64_add()
to be "long" rather than "int" looks to have cleared up the problems I
was seeing. I
could generally see the hung processes in less than 10 consecutive
kernel builds, but
ran a few thousand builds over the weekend with no issues.

If git is multi-threaded, it may be hitting some different code path
... but it isn't trivial
for me to try this out (my systems are on an isolated lab network segment).

-Tony
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Messages in current thread:
tasks getting stuck on mmap_sem?, David Miller, (Mon Aug 16, 9:12 pm)
Re: tasks getting stuck on mmap_sem?, Linus Torvalds, (Tue Aug 17, 9:14 am)
Re: tasks getting stuck on mmap_sem?, Tony Luck, (Tue Aug 17, 11:24 am)
Re: tasks getting stuck on mmap_sem?, Tony Luck, (Tue Aug 17, 1:46 pm)
Re: tasks getting stuck on mmap_sem?, Linus Torvalds, (Tue Aug 17, 2:08 pm)
Re: tasks getting stuck on mmap_sem?, Tony Luck, (Tue Aug 17, 2:26 pm)
Re: tasks getting stuck on mmap_sem?, Linus Torvalds, (Tue Aug 17, 2:28 pm)
Re: tasks getting stuck on mmap_sem?, David Miller, (Tue Aug 17, 2:44 pm)
Re: tasks getting stuck on mmap_sem?, Michel Lespinasse, (Tue Aug 17, 2:47 pm)
Re: tasks getting stuck on mmap_sem?, David Miller, (Tue Aug 17, 2:59 pm)
Re: tasks getting stuck on mmap_sem?, David Miller, (Tue Aug 17, 4:40 pm)